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Fair Value Measurements Estimated Fair Value of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Secured Long-term Debt, Noncurrent $ 2,248,748 $ 2,259,654
Non-Publicly Held Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Secured Long-term Debt, Noncurrent 1,820,368 1,826,921
Non-Publicly Held Debt | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value $ 1,815,856 $ 1,815,351